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Comparative evaluation of three semi-quantitative radiographic grading techniques for hip osteoarthritis in terms of validity and reproducibility in 1404 radiographs: report of the OARSI-OMERACT Task Force
Division of Health Care and Outcomes Research, Arthritis and Community Research and Evaluation Unit, Toronto Western Research Institute, Toronto, Ontario, Canada
Departments of Rehabilitation Science and Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada